Make sure that the initializing

Start("","")
return

sequence is the last command in the last file you give to luac. luac joins all given files straight one after the other, and lua executes that stuff straight from the beginning. If it thereby runs into the Start(“”,“”) command, the program starts to become active. But if because of the linking sequence the initialisation of other important global variable etc. comes after the Start() command, you'll end up with a crash because of missing variable initialisations.